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- Kamesh Arumugam, Alexander Godunov, Desh Ranjan, Balsa Terzic, Mohammad Zubair
- 2013 42nd International Conference on Parallel…
- 2013

Recent development in Graphics Processing Units (GPUs) has enabled a new possibility for highly efficient parallel computing in science and engineering. Their massively parallel architecture makes GPUs very effective for algorithms where processing of large blocks of data can be executed in parallel. Multidimensional integration has important applications… (More)

- M A Kornberg, A L Godunov, S Itza-Ortiz, D L Ederer, J H McGuire, L Young
- Journal of synchrotron radiation
- 2002

The planned construction of an X-ray free-electron laser (XFEL) will provide new opportunities for research in various areas of physics, chemistry and biology. The proposed design of the XFELs at DESY (Deutsches Elektronen-Synchrotron) and SLAC (Stanford Linear Accelerator Center) is built on the concept of a fourth-generation synchrotron source and will… (More)

- A L Godunov, J H McGuire
- 2001

We propose an independent time approximation (ITA), defined by simplifying the chronological operator, namely, T Tunc, where Tunc is the uncorrelated limit of the chronological operator T . The concept of the time correlation is analogous to spatial electron correlation. In both cases ‘correlation’ is the difference between an exact result and an… (More)

- Kamesh Arumugam, Alexander Godunov, Desh Ranjan, Balsa Terzic, Mohammad Zubair
- 20th Annual International Conference on High…
- 2013

We present a memory-efficient algorithm and its implementation for solving multidimensional numerical integration on a cluster of compute nodes with multiple GPU devices per node. The effective use of shared memory is important for improving the performance on GPUs, because of the bandwidth limitation of the global memory. The best known sequential… (More)

- A L Godunov, J H McGuire, P B Ivanov, V A Shipakov, H Merabet, Kh Kh Shakov
- 2001

Cross sections for ionization with excitation and for double excitation in helium are evaluated in a full second Born calculation. These full second Born calculations are compared to calculations in the independent electron approximation, where spatial correlation between the electrons is removed. Comparison is also made to calculations in the independent… (More)

- J H McGuire, A L Godunov, Kh Kh Shakov, V A Shipakov
- 2003

Time ordering of interactions in dynamic quantum multi-electron systems provides a constraint that interconnects the time evolution of different electrons. In energy space, time ordering appears as the principal value contribution from the Green function,which corresponds to the asymptotic condition that specifies whether the system has outgoing (or… (More)

- A. L. Godunov, J. H. McGuire, S. G. Tolmanov, R. D6rner, H. Schmidt-B6cking, R. M. Dreizler
- 2001

We show that time correlation between electrons requires that the Dyson time ordering operator, T, differs from its uncorrelated value and spatial electron-electron correlation be present. In this paper we decompose T into an uncorrelated term, Tunc, plus a correlated term, Tcor = T — Tunc, which leads to time correlation in time dependent external… (More)

- A L Godunov, J H McGuire, V S Schipakov, H R J Walters, Colm T Whelan
- 2006

The effects of electron correlation and second-order terms on theoretical total cross sections of transfer ionization in collisions of the helium atom with fast H+, He2+ and Li3+ ions are studied and reported. The total cross sections are calculated using highly correlated wavefunctions with expansion of the transition amplitude in the Born series through… (More)

- J H Mcguire, A L Godunov, Kh Kh, Shakov, Kh Yu Rakhimov, A Chalastaras
- 2003

We examine how time ordering works in quantum mechanics and in classical mechanics.

- Kamesh Arumugam, Ravi Teja Majeti, Desh Ranjan, Mohammad Zubair, Alexander Godunov, Balsa Terzic
- SummerSim
- 2017